/*---------------------------------------------------------------------------*
  Project:  NitroSDK - GX - demos - UnitTours/Sub_Oam_3
  File:     main.c

  Copyright 2003,2004 Nintendo.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law.  They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Log: main.c,v $
  Revision 1.6  2004/04/07 01:23:27  yada
  fixed header comment

  Revision 1.5  2004/04/06 12:48:07  yada
  fixed header comment

  Revision 1.4  2004/02/24 05:25:21  yasu
  used OS_EnableIrqMask instead of OS_SetIrqMask

  Revision 1.3  2004/02/12 09:33:51  nishida_kenji
  GXOamColor->GXOamColorMode.

  Revision 1.2  2004/02/05 07:09:03  yasu
  changed SDK prefix iris -> nitro

  Revision 1.1  2004/02/02 06:31:38  nishida_kenji
  based on 2D_Oam_3

  $NoKeywords: $
 *---------------------------------------------------------------------------*/

//---------------------------------------------------------------------------
// A sample that scales an OBJ:
//
// USAGE:
//   A: scaling down
//   B: scaling up
//
// HOWTO:
// 1. Set up the character/palette/attribute data same as Sub_Oam_1.
// 2. Set up a matrix by G2_SetOBJAffine().
// 3. Transfer the copy of object attribute memory by GXS_LoadOAM().
//---------------------------------------------------------------------------

#include <nitro.h>
#include "DEMO.h"
#include "data.h"

static GXOamAttr sOamBak[128];                             // Buffer for OAM

void NitroMain(void)
{
    fx32 revScale = FX32_ONE;

    //---------------------------------------------------------------------------
    // Initialize:
    // They enable IRQ interrupts, initialize VRAM, and make OBJ visible.
    //---------------------------------------------------------------------------
    DEMOInitCommon();
    DEMOInitVRAM();
    DEMOInitDisplaySubOBJOnly();

    //---------------------------------------------------------------------------
    // Transmitting the character data and the palette data
    //---------------------------------------------------------------------------
    GXS_LoadOBJ(d_64_256_obj_schDT, 0, sizeof(d_64_256_obj_schDT));
    GXS_LoadOBJPltt(d_64_256_obj_sclDT, 0, sizeof(d_64_256_obj_sclDT));

    MI_DmaFill32(3, sOamBak, 192, sizeof(sOamBak));    // let out of the screen if no display

    DEMOStartDisplay();
    //---------------------------------------------------------------------------
    // Main Loop
    //---------------------------------------------------------------------------
    while (1)
    {
        MtxFx22 mtx;

        DEMOReadKey();

        if (DEMO_IS_PRESS(PAD_BUTTON_A))                   // scaling down
            revScale += 1 << 7;
        if (DEMO_IS_PRESS(PAD_BUTTON_B))                   // scaling up
            revScale -= 1 << 7;
        if (DEMO_IS_TRIG(PAD_BUTTON_SELECT))
            revScale = FX32_ONE;
        if (revScale < 1)
            revScale = 1;

        G2_SetOBJAttr(&sOamBak[0],                         // a pointer to the attributes
                      0,                                   // x
                      0,                                   // y
                      0,                                   // priority
                      GX_OAM_MODE_NORMAL,                  // OBJ mode
                      FALSE,                               // mosaic
                      GX_OAM_EFFECT_AFFINE_DOUBLE,         // flip/affine/no display/affine(double)
                      GX_OAM_SHAPE_64x64,                  // size and shape
                      GX_OAM_COLORMODE_256,                // OBJ character data are in 256-color format
                      0,                                   // character name
                      0,                                   // color param
                      0                                    // affine param
                      );
        
        mtx._00 = revScale;
        mtx._01 = 0;
        mtx._10 = 0;
        mtx._11 = revScale;

        G2_SetOBJAffine((GXOamAffine *) & sOamBak[0], &mtx);

        // Store the data onto the main memory, and invalidate the cache.
        DC_FlushRange(sOamBak, sizeof(sOamBak));

        SVC_WaitVBlankIntr();                              // waiting for the end of V-Blank interrupt
        
        GXS_LoadOAM(sOamBak, 0, sizeof(sOamBak));
    }
}

//---------------------------------------------------------------------------
// V-Blank interrupt function:
//
// Interrupt handlers are registered on the interrupt table by OS_SetIRQFunction.
// OS_EnableIrqMask selects IRQ interrupts to enable, and
// OS_EnableIrq enables IRQ interrupts.
// Notice that you have to call 'OS_SetIrqCheckFlag' to check a V-Blank interrupt.
//---------------------------------------------------------------------------
void VBlankIntr(void)
{
    OS_SetIrqCheckFlag( OS_IE_V_BLANK );                   // checking V-Blank interrupt
}
